Ask what happens when you turn it back up
A setback means choosing a lower heating temperature for a period. Recovery means bringing the home back to your usual setting. Ask the technician how your controls handle that change: which equipment runs, whether backup can be called, and what schedule the manufacturer supports.
We would avoid a large daily temperature change based on a furnace routine without checking this. If the system calls expensive backup to recover, ask whether a smaller change, different timing, or supported recovery setting is appropriate. Have a qualified technician make any installer-level change.
Do not disable backup or use emergency heat as a trial savings strategy. Ask what the normal and emergency settings mean on your installed system.
Match the plan to the absence
Sleeping, a workday away, and a long winter trip are different situations. Tell the technician how long you are away, your comfort needs on return, and any vulnerable rooms or pipes. Ask for an approved plan for each situation you actually use.
For a trial within that plan, record the schedule, indoor comfort, recovery time, and visible backup indications. Compare similar weather rather than judging from one unusually warm or cold day. Utility use can help evaluate the result, but it needs context.
If recovery is slow or rooms remain cold, report it. Do not assume the solution is a larger thermostat jump. Ask for a check of settings and system performance.
Get the instructions in plain language
Request the normal setting, allowed schedule changes, how to return from an absence, and when to call for help. These should be homeowner controls you can use without accessing wiring or hidden menus.
Your next step is a model-specific thermostat conversation. We would keep the starting plan simple, then adjust it with evidence rather than treating “never change it” or “always turn it down” as a universal rule.